Dropping-bottle.



L. KAUFMANN.

3 DROPPING BOTTLE. APPLICATION FILED APR.21,1913.

Patented Dec. 30, 1913.

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COLUMBIA PLANDGRAI'H C11. WASHINGTON, D. C.

UNITED STATES PATENT OFFICE.

LUDWIG KAUFMANN, OF BERLIN, GERMANY, ASSIGNOR TO WARMBRUNN, QUILITZ & 00., APPARATE BAUANSTALT, OF BERLIN, GERMANY.

DROPPING-BOTTLE.

Application filed April 21, 1813.

To all whom it may concern:

Be it known that I, LUDWIG KAUFMANN, subject of Germany, residing at Berlin, Germany, have invented new and useful Improvements in Dropping-Bottles, of which the following is a specification.

For working with solutions, used for therapeutic purposes, which are subject to changes when exposed to the air, it is desirable to have a vessel for containingand dispensing such solutions, which vessel on the one hand has a self-acting closure, so that the contents is shut off from the air without need of a special closing means, and on the other hand, without any parts of the vessel itself being moved, the liquid can be dispensed in any desired quantity, from single drops to a thin stream.

The present invention, now, has the object of solving this problem. For the purpose of the present invention a curved air pipe is used which projects far into the interior of the bottle. Such air pipes are by themselves already known. A novel feature of the air pipe used according to the present invention is that it has a bend, the direction of which is opposite to that of the spout pipe. By such arrangement a siphon effect is produced in letting the liquid emerge from the bottle.

In the accompanying drawing Figure 1 is a vertical sectional view of a vessel c011- structed in accordance with the invention. Fig. 2 is a similar view of a modified form.

Into the neck of the bottle F in Fig. 1 a cap has been ground and fitted, in place of the stopper, the said cap D forming an antechamber for the liquid, which will emerge through the pipe R proceeding from the top of said cap. This pipe R extends into the interior of the cap as tapers down until it has the size of a capillary tube K. The object of this capillary tube is to retain by capillary attraction so much liquid, after the dispensing has been completed, that the interior of the vessel is shutoff from the outside air. This closure will last forever with non-volatile liquids, and very long with little volatile liquids, and will disappear after some time only with easily volatile liquids. In such cases the capillary tube K is made in form of a U shaped tube, Fig. 2, the shorter leg of which is enlarged to form a small chamber V for Specification of Letters Patent.

Patented Dec. 30, 1913.

Serial No. 762,658.

holding the sealing liquid. This form also is suited for very heavy liquids, for instance mercury, which, owing to its gravity, will not be retained in very small capillary tubes.

The volatilization of the liquid will, besides, proceed chiefly toward the interior of the bottle, and only to a moderate extent toward outside, so that even in such cases when the bottle is left unused for a considerable length of time and the sealing liquid has gradually evaporated, there will be no considerable loss or changes of substances which are very easily affected by the air.

For allowing of the liquid emerging from the tube B, when the bottle is held in the proper position, lb is of course necessary for air to enter into the bottle. This is rendered possible in known manner by means of an air pipe L, which may be either capillary or of a greater width, and which will fill with the liquid either by capillarity or after the law of communicating tubes so that also here a rapid seal is obtained by the liquid against outside. The air pipe preferably extends almost down to the bottom of the vessel, so that any air entering passes only through very little of the liquid, what is particularly important with liquids affected by the air. By providing a small hole 0 it is also possible to let the air enter immediately into the interior of the vessel, without its having to pass through the liquid.

The air pipe, which almost reaches to the bottom of the vessel is, according to the present invention, bent toward the wall 0pposite to the mouth of the tube R. The object of this is that when the vessel is inclined from its vertical position for the purpose of dispensing the liquid, the bent end will act as a siphon and thereby accelerate the commencement of the discharge. This can be further assisted by enlarging the inside opening of the tube and letting it terminate at a bevel whereby the dropping off of the liquid and the entrance of air is facilitated. The fine hole 0 will not impair the siphon effect, so that the liquid can drop and a suction in the other part of the air pipe toward the lower end can be produced. It is only important that the liquid column is not broken at the hole. When the liquid has been removed by dropping and suction, the air entering from outside can finger in the manner customary with pipettes.

It is obvious, that the discharge can be controlled by completely closing, partly or completely opening the beaded mouth of the air pipe. If, instead of air, aninert gas is to be allowed to enter into the bottle, the pipe L is extended somewhat farther outside, so that a flexible tube leading to the gas holder can be fitted on it.

I claim:

1. A dropping bottle provided with a discharge pipe and with a bent air pipe eX- tending deep into the interior of the bottle, the said air pipe being bent toward the wall opposite to the mouth of the discharge pipe and then in the opposite direction and terminating adjacent the bottom of the bottle, and adapted to act as a siphon.

2. A dropping bottle provided with a discharge pipe and with a bent air pipe eX- tending deep into the interior of the bottle, the said air pipe being bent toward the wall opposite to the mouth of the discharge pipe, and adapted to act as a siphon, the inner end of said discharge pipe being bent in the form of a U and having a chamber formed in its inner leg to retain the liquid to form a seal.

3. A dropping bottle provided with a discharge pipe and with a bent air pipe extending deep into the interior of the bottle, the said air pipe being bent toward the wall opposite to the mouth of the discharge pipe, and adapted to act as a siphon said air pipe being provided at a point above its inner end with a hole, said hole being too small to prevent the siphon action but being of sufficient area to allow the entering air to pass into the bottle without passing through the liquid.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

DR. LUDWIG KAUFMANN.

WVitnesses HENRY HAsPEn, W'OLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

